byDittmar, James H.; Hall, David G.; Moore, Royce D
The tone noise levels of a supersonic throughflow fan were measured at subsonic and supersonic axial duct Mach numbers. The noise in the inlet plenum showed no blade passing and harmonic tones at subsonic or supersonic axial flow conditions. At subsonic axial flow conditions, the supersonic throughflow fan showed no inlet plenum tones at fan operating conditions where tone noise had been previously measured for a subsonic fan design. This lower inlet-quadrant noise level for the supersonic... Topics: AEROSPACE ENGINEERING, DATA BASES, REMOTE SENSING, REMOTE SENSORS, DATA SYSTEMS, EARTH SCIENCES,...